ZFG will be hands down one of the best options for the edge with larger than stock turbos. Datalogging is part of the tuning process and is needed in order to adjust the over 2000tables the car references in daily driving. if you have fowled plugs its due to fueling issues which after about 5-10 revisions should be dealt with.
Plugs cost no more than 75~90 bucks with shipping, who is charging you 350.00 to change them?
National speed is our dyno sponsor and is a fantastic place to get tuned even though they have limited knowledge on the ecoboost 14G371 ECM logic. Its a very complex and not straight forward logic to tune and will usually render low numbers if the user/tuner is not familiar.
if changing plugs makes that much a difference most likely the gap and heat range was previously incorrect.
In order to judge these numbers we do need to know a comprehensive list of engine mods and parts added. these seem low with aftermarket turbos on 93. you should have seen 450+.
Larger compressor turbos can and will cause pressure increase and flow increase causing the computer to add more fuel. This is not an uncommon side affect, and one that can be hard to manage with the fomoco 14G371 logic